28920699 has 16 divisors (see below), whose sum is σ = 42928800. Its totient is φ = 19243008.

The previous prime is 28920677. The next prime is 28920707. The reversal of 28920699 is 99602982.

It is not a de Polignac number, because 28920699 - 2⁵ = 28920667 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28920599) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24507 + ... + 25659.

It is an arithmetic number, because the mean of its divisors is an integer number (2683050).

Almost surely, 2^28920699 is an apocalyptic number.

28920699 is a deficient number, since it is larger than the sum of its proper divisors (14008101).

28920699 is a wasteful number, since it uses less digits than its factorization.

28920699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2091 (or 2085 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 28920699 is about 5377.7968537311. The cubic root of 28920699 is about 306.9513834745.

The spelling of 28920699 in words is "twenty-eight million, nine hundred twenty thousand, six hundred ninety-nine".